Coverage Report

Created: 2021-05-04 09:02

/src/botan/build/include/botan/internal/gost_28147.h
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/*
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* GOST 28147-89
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* (C) 1999-2009 Jack Lloyd
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*
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* Botan is released under the Simplified BSD License (see license.txt)
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*/
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#ifndef BOTAN_GOST_28147_89_H_
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#define BOTAN_GOST_28147_89_H_
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#include <botan/block_cipher.h>
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namespace Botan {
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/**
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* The GOST 28147-89 block cipher uses a set of 4 bit Sboxes, however
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* the standard does not actually define these Sboxes; they are
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* considered a local configuration issue. Several different sets are
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* used.
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*/
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class GOST_28147_89_Params final
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   {
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   public:
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      /**
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      * @param row the row
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      * @param col the column
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      * @return sbox entry at this row/column
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      */
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      uint8_t sbox_entry(size_t row, size_t col) const;
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      /**
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      * @return name of this parameter set
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      */
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      std::string param_name() const { return m_name; }
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      /**
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      * Return a representation used for building larger tables
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      * For internal use
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      */
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      uint8_t sbox_pair(size_t row, size_t col) const;
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      /**
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      * Default GOST parameters are the ones given in GOST R 34.11 for
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      * testing purposes; these sboxes are also used by Crypto++, and,
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      * at least according to Wikipedia, the Central Bank of Russian
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      * Federation
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      * @param name of the parameter set
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      */
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      explicit GOST_28147_89_Params(const std::string& name = "R3411_94_TestParam");
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   private:
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      const uint8_t* m_sboxes;
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      std::string m_name;
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   };
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/**
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* GOST 28147-89
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*/
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class GOST_28147_89 final : public Block_Cipher_Fixed_Params<8, 32>
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   {
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   public:
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      void encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
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      void decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
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      void clear() override;
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      std::string name() const override;
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      std::unique_ptr<BlockCipher> new_object() const override { return std::make_unique<GOST_28147_89>(m_SBOX); }
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      /**
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      * @param params the sbox parameters to use
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      */
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      explicit GOST_28147_89(const GOST_28147_89_Params& params);
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      explicit GOST_28147_89(const std::string& param_name) :
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         GOST_28147_89(GOST_28147_89_Params(param_name)) {}
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      explicit GOST_28147_89(const std::vector<uint32_t>& other_SBOX) :
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         m_SBOX(other_SBOX), m_EK(8) {}
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   private:
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      void key_schedule(const uint8_t[], size_t) override;
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      /*
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      * The sbox is not secret, this is just a larger expansion of it
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      * which we generate at runtime for faster execution
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      */
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      std::vector<uint32_t> m_SBOX;
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      secure_vector<uint32_t> m_EK;
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   };
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}
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#endif